Expression of renin and angiotensinogen genes in the human placental tissues.

The expression of renin and angiotensinogen genes in the human placenta and related tissues has been examined by RNA blot hybridization analysis with specific human complementary DNA (cDNA) probes. Renin mRNA was detectable in the chorion throughout pregnancy and in the hydatidiform moles, but not in the decidua, amnion or myometrium. The relative concentration of renin mRNA in the chorion was at the highest level in early pregnancy and decreased thereafter, while the total amount contained in the whole placenta was at the lowest level in early pregnancy, and increased thereafter, reaching at term about one-sixth of the total renin mRNA in the kidney. Hydatidiform moles had an even higher concentration of renin mRNA than the early chorion. There was no significant difference in either the relative concentration or the total renin mRNA content in the placentae from 4 normal and 4 toxemic pregnancies. Angiotensinogen mRNA was undetectable in any of the placental tissues, hydatidiform moles or myometrium. These results show that renin is synthesized in the placenta, possibly to play some physiological role locally by utilizing angiotensinogen which is abundantly present in the maternal systemic circulation.

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